Improvement in double reversible lathes



2 Sheets-Sheet 1.

J. H. WILSQN. DOUBLE REVERSIBLE LATHE.-

Patented June 27,1876.-

N. PETERS, FHDTOUTNOGR Y '2 Sheets-Sheet Z.

J'. H. WILSON. E

DOUBLE REVERSIBLE LATHE. N 179,Z 45 Patented June 27,1876.

. h, i (my? UNITED JOSEPH H. WILSON, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN DOUBLE REVERSIBLE LATHES.

Specification forming part of Letters Patent No. 179,245., dated June 27, 1876; application filed i September 27, 1875.

To all whom it may concern:

Be it known that I, J OSEPH H. WILsON, of Boston, in the county of Suffolk and State of Massachusetts, have invented an Improve ment in DoubleReversible Lathes, of which the following is a specification:

My invention consists in the combination, with a turning-lathe, of a reversible frame, so constructed and arranged that while the cutters are operating upon the article to be molded at one side of the frame a blank or stick of wood may be fixed in the opposite side of the frame, and when the operation of molding is completed the frame may be readily reversed, the molded article removed, and a new piece of wood inserted in the frame, and so the operation is continued without stopping the machine or interrupting the process of molding.

My invention further consists in a combination of devices, by means of which the backrest is automatically adjusted to bear against the article to be molded during the operation of cutting, thus serving to prevent the vibration of the article being molded, and insuring the steadiness of the same while subjected to the action ofthe cutters.

Referring to the drawings, Figure l is a perspective view of a machine embodying my invention. Fig. 2 shows the arrangement of belting and pulleys at one end of the reversible frame, by means of which the motion of the lathe is continued while the position of the frame is changed. Figs. 3, 4, and 5 are enlarged views, in detail, of the devices for operating the back-rest.

Similar letters represent like parts in the different figures.

a 0 represent the frame of the machine, which may be ofany suitable size. In this frame is mounted a counter-shaft, b. the shaft is the reversible frame, composed of the arms 0 0, arranged near the ends of the shaft, and the sides h h, parallel with the shaft, and connected to the ends of the arms 0 c. The side pieces h h consist of metal plate, of

trough-like form, opening toward the center of the frame, and having a slot, 70, on their outer sides, extending nearly the whole length of the same. Attached to the ends of the sides h it of the frame, at one side, are two convex bearing-surfaces, ff, which are made to bear against a friction -pulley, l, Figs. 1 and 3.

Supported on On the outer sides of the reversible frame are arranged the stocks m m, for holdin g the blank or piece of wood to be molded, the latter being inserted and secured as in an ordinary lathe.

At one side of the machine is arranged an endless belt, 2 2, carried over a series of pulleys, as shown in Fig. 2.

Motion is imparted to the belt 2 by the pulley 6, which is attached to the outer end of the counter-shaft b. a

The belt 2 passes over the top of pulley 6, thence under and around pulley 7, thence around pulley 4 to pulley 5, passing thence to pulley 3, and over pulley 8 back to pulley 6. By this arrangement an uninterrupted and continuous rotation of the piece of wood to be molded is maintained, while the reversible frame is turned to remove the molded article,

and insert a new stick or piece of wood in the stocks.

At or near the center of each of the side pieces h h of the reversible frame is adjustably arranged a back-rest, 1). This consists of a metal bar having a notch on. its front or outer end, which is designed to bear against the article being turned during the process of molding the same. lts projecting end is supported in a head, 9, Fig. l, which is so connected with the side piece It as to admit of its being movedlaterally to adjust it to any desired position with relation to the article turned. The rear or inner end of the back-rest 10 is supported in a bent bar, 0, which is attached to the head 9, so as to move or slide freely in the same. To the rear end of the back-rest is attached a spring, d, which serves to draw it back when not forced forward by the mechanism to be described. Through the bent bar or supporting-pieceo and the back-rest p is a slot, in which is caused to slide abar, t, and attached to this bar is an inclined piece, a", which, as

it is forced through the slot in the back-rest,

causes the latter to move outward, so as to bear against the article turned. As the first motion of the back-rest is required to be somewhat quickened, the incline on the front portion is greater than that of the rear portion, which may be eased off, as shown'by the dotted lines in the piece 0, Fig. 3.

On the opposite end of the sliding bar it is a projection, to which is attached a rod or bar, 8, which passes through the side 0 of the reversible frame, so as to slide freely in the same. A retracting-spring on the bar 8 causes the said bar to be forced outward, so that its end will project beyond the side 0.

Just opposite the end of the portion a of the spring-rod s, when the reversible frame is in the position shown in Fig.3, is a bar, 11, which is fitted to slide in a block, 17, on the side of the frame a, Fig. 3. On the inner end of the sliding bar 22 is a projection extending above the block, to which is attached an elastic cord, as, for the purpose of keeping the bar forced outward when not actuated by the cam-wheel, and to keep it in contact with the cam portion of the wheel g. Any other form of spring for actuating the bar 1: which can be conveniently applied may be used instead of the elastic cord at.

On the outer side of the portion 6 of the reversible frame is attached an inclined block or cam piece, 00, as shown in Figs. 1, 3, and 4.. The inclined portion of the cam-piece x is designed to bear against a rod or bar, 11 which is arranged to slide freely in the block or bearing 17, that holds the sliding rod 12. The outer end of the sliding rod 3 is made to bear against the cam-piece 00 by means of a spring, 2, attached to the standard a, as shown in Fig. 4. The opposite end of the sliding bar y is designed to bear against the end ofa springbolt, 0, which is fitted in a boss, I), on the inner face of the cam-wheel g, which is arranged near the large end to on the cam-wheel, as shown in Fig. 5.

The cam-wheel g has its bearing on the end of the shaft b, but does not move with it, motion being imparted to it by means of the band 14, running over the pulley 19, which is attached to the counter-shaft 20.

The position of the spring-bolt c and boss I) may be adjusted, as occasion requires, by means of a bolt in the slot 15 of the cam-wheel g. 011 the outer end of the shaft of the friction-pulley l is a cog-wheel, 10, which gears with a pinion, 13, on the shaft of the bandwheel 21, Fig. 1. The end of this shaft has its bearing in the short arm of a lever, 11, the long arm of which extends to the front of the machine under the control of the operator. The object of this arrangement is to throw the wheel 10 out of gear, and stop the motion of the friction-pulley l, in case of any obstruction. Motion is imparted to the gear-wheel 10 from the pinion 13 on the shaft of band-wheel 21, the band 12 passing over pulley 19 on the shaft 20. At the rear of the machine is arranged the cutter head 0 provided with grooves for the reception of the various cutters used in forming the molded article. As this feature is in common use, and forms no part of my invention, it need not be here further described.

- ()n the outer side of the block through which the slidingrody passes is a shoulder or seat, 18, which serves as a stop to the spring-bolt 0 The operation is as follows: The various running parts being all put in motion, the operator' places the blank or stick it to be molded in the stocks. The reversible frame It 71 e e is then turned, the front portion being pushed downward. As this end rises on the opposite side and approaches the cutting-cylinder, the convex bearing-surface f comes in contact with the friction-pulley l, by which means motion is imparted to the reversible frame, the time of contact being sufficiently long to make one revolution of the article being turned, and complete the molding of the same.

As soon as the convex bearing-surface f comes in contact with the friction-pulley l, the cam-piece w bears upon the end of the sliding rod Q, which, in turn, forces back the spring-bolt 0 into the boss Z), so as to pass the shoulder 18, thus allowing the cam-wheel g to rotate, previous to which action the cam-wheel is held stationary, and the belt 14 is allowed to slip on the same. The object of the shoulder 18 is to hold the cam-wheel in position until it becomes necessary to commence to operate the back-rest.

As soon as the spring-bolt 0 passes the shoulder 18 the cam wheel commences to move. The sliding rod or bar 17 bears against the narrowest part of the cam-rim g. -As the cam-wheel g rotates, the increasing inclination of the cam acts on the sliding bare and forces it against the spring-rod u s and bar t, that carries the inclined piece 1". This incline, entering the slot in the back-restp, forces the latter outward against the article being molded, and gives it a firm steady bearing until the cutting is completed. When the molding is co mpleted the cam-wheel will have made one revolution, and the sliding bar '0, passing over the large end of the cam w, Figs. 3 and 5, re-

leases the spring-rod u 8, thus withdrawing the incline r, and the back-rest p is retracted by the elastic cord 00.

I The entire molding 0f the article operate upon and the revolution of the cam-wheel occupy the same time that the friction-pulley l is in contact with the con vex bearin g-surfaee f. The incline 1 may be adjusted to regulate the degree of motion of the back-rest, as required.

The reversible frame being hung on a center, it is evident that the article to be molded will pass through the arc of a circle as it is subjected to the action of the cutters. A very high rate of speed is imparted to the cutterhead, the revolutions being about four thousand a minute, while those of the article molded are about fifty a minute. By this means, and in connection with the back-rest, I am enabled to complete the entire molding of any article with a single cutting-cylinder. I am thus enabled to turn out a very large amount of work in a short space of time with perfect uniformity and exactness.

The cutters for molding every required part of the article operated upon are first secured in the grooves of the cutter-head, in the usual manner.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, in a turning-lathe, of a rotating and reversible frame, composed of the side pieces 0 e and slotted pieces h h, and mounted on the shaft I), and having the stocks m m arranged on the outer sides of the said frame, the whole being constructed substan tially as described, so that while the cutters are operating upon the article to be molded at one side of the frame, a blank may be fixed in the opposite side, as and for the object specified.

2. The combination of the rotating reversible frame, the back-rest 19, bar If, incline a", rod a, spring 8, sliding bar 21, and cam-Wheel g, the whole being constructed and arranged substantially as described, whereby the reversible frame can be rotated on its axis with- Y the endless belt 2 and the system of pulleys 3 4 5 6 7 8, arranged and operating as and for the purpose set forth.

4. The adjustable spring-bolt c on the camwheel g, in combination with the sliding springbar y and incline or cam-piece w on the reversible frame, as and for the purpose specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOSEPH H. WILSON.

Witnesses:

J. H. ADAMS, E. A. STOCK. 

